Which of the following statements about propylthiouracil is false.. It interferes with the effectiveness of exogenously administered thyroid hormones

Which of the following statements about propylthiouracil is false?
a- It is used for treatment of hyperthyroidism
b- It inhibits the synthesis of thyroid hormones
c- It diminishes peripheral deiodination of T4 and T3
d- It inhibits iodide oxidation
e- It interferes with the effectiveness of exogenously administered thyroid hormones***